Foldable test tube rack



FIG. 1 is a front view of a foldable test tube rack showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is a left side view thereof in a folded state;

FIG. 9 is another perspective view thereof in a partially folded state; and,

FIG. 10 is another top plan view thereof in an unfolded, developed state.

The broken lines in the drawings depict fold lines and form part of the claimed design. 

CLAIM The ornamental design for a foldable test tube rack, as shown and described. 